Means for cooling internal-combustion engines



'Jah. 41-1927. 1,612,868

' J. w.. HUDSON MEANS FOR COOLING INTERNAL COMBUSTION ENGINES Filed Nov. 15, 1920 ATTORNEY Patented Jan. 4, 1927.

UNITED STATES JOHN. W. HUDSON, 0F LYNBROOK, NEW YORK.

MEANS FOR COOLING INTERNAL-COMBUSTION ENGINES.

Application filed November 15, 1920. Serial No; 424,291.

This invention relates to improvements in internal combustion engines, and has particular relation to the cooling fins or flanges of an air-cooled engine of this type. The principal object is to produce cooling flanges or fins which shall be more efficient for conducting the sensible heat from the cylin ders and combustion chamber.

Another object is to construct a cooling device particularly suitable for use on engines having a large cubic displacement.

Another ob ect is to provide a cooling device which shall comprise fins or flanges constructed of a plurality of metals having various degrees of conductivity, so as to give up the radiant heat more readily.

Another object is to join the different metals at a point so calculated as not to set up any undue strain on the cylinder through the varying expansion of the different metals used.

Another object is to design flanges that can be securely attached to the cylinder member, flanges so as not to interfere with the radiation of the heat.

With these and other objects in view which will become apparent as the specification proceeds, the invention resides in certain novel construction and combination and arrangements of parts, the essential features of which are hereinafter fully described and particularly pointed out in the claims, and which are shown in the accompanying drawing comprising one sheet, in which Figure 1 is a fragmentary vertical sectional view of a cylinder of an internal combustion engine provided with my invention.

Figure 2 is a fragmentary view showing the method of attaching the outer portion of the flange to the portion which is cast integral with the cylinder.

Fig. 3 is a top plan view.

Like characters of reference refer to like parts in all views.

This invention contemplates machining the forging of the cylinder of an aircooled internal combustion engine with short flanges, and of then pressing into place copper extensions to said flanges and then welding the two together, so that the greater conductivity of the copper portion may rapidly conduct away and disperse the radiant heat from the cylinder. The inner edge of the extensions are cross sectional rounded to conform to the outer edge of the short flanges.

Referring to the drawing in detail, 10 represents the body of a cylinder of an aircooled internal combustion engine, which is provided with the usual valve mechanism as shown at .11. The cylinder is also provided with short flanges 12 having a curved or other shaped exterior surface. For each of the flanges 12 there is provided an extension portion 13 preferably of copper or of some other metal of greater conductivity than the metal of the cylinder proper. This portion 13 is first made as a dished member as shown in Figure 2, and is then pressed down into a flat disk as shown in Figure 1, the curved face 14 of the member 13 being adapted to grip about the curved outer face of its respective flange 12. The members 12 and 13 are then soldered together with any suitable hard solder-silver being preferred.

The fins or flanges may be either blank or provided with apertures 15 as shown in the drawings for the better circulation of the cooling air. As shown in Figure 1, the apertures of one plate are aligned with the apertures of the adjacent plate. Bridging the upper end of the cylinder and having the lower ends of the arms 16 secured to the uppermost flange or fin there are substantially elongated U-shaped perforated members or fins 17 vertically arranged with respect to the top of the cylinder to provide an additional means for cooling the cylinder.

It is of course understood that the distance which the short flange 12 extends from the cylinder will be constructed greater or less than that shown according as the displacement volume of the cylinder is greater or less and the consequent heat of the cylinder in action becomes greater or less. This position for the joining of the two elements 12 and 13 is carefully computed so as to prevent any undue strain on the cylinder due to the differences of expansion of the metals used.

\Vhile I have described what I consider to be the most desirable embodiment of my invention, it is obvious that many of the details may be varied without in any way departing from the spirit of my invention, and I therefore do not limit myself to the exact details of construction herein set forth nor to anything less than the Whole of my invention limited only by the appended claim.

What is claimed as new is An air cooled cylinder for internal combustion engines having relatively small flanges extending outwardly from the Walls thereof, apertured flanges tapered outwardly and formed With curved inner faces received on the outer edges of the relatively short flanges in a manner to align the apertures of all said apertured flanges and substantially U-shaped elongated apertured fins having the lower ends of their arms secured to the upper flange upon opposite )5 JOHN W. HUDSON. 

